Native American dna-Shawnee

Hello, My paternal grandmothers line was tested and her mitochondrial dna showed two separate Native American haplo groups. I am now trying to track down where these came in at.I am posting on the Greene forum hoping that Don Greene would see this posting. I know my family history shows much interaction with different tribes. Some of my family names are Ewing, See, Shaver, Lloyd, Hyer, Riffle, Dean, Hefner, Warner, Walton, Perrine, Evans, Petro etc. Many of my direct ancestors are listed on Ewings' list. William "Swego Bill" Ewing is my 4 great grandfather. I am hoping that someone in the Greene forum knows Don Greene who wrote the Shawnee Heritage book as I am trying to find a way to contact him, as he may have some clue or info that could help me track down my Native American connections. Thanks, Don.